SELACHIT. 



FIG. 34. 



Hybodus haufflanus ; imperfect skeleton, about one-tenth nat. size. U. Lias ; 

 Wiirtemberg. d 1 , d 2 , dorsal fin-spines; h, haemal arches; md., mandible: 

 n, neural arches ; not., notochord ; pet., pectoral arch. (After E. Fraas.) 



FIG. 35. 



Hybodus delabechei ; outline of fossilized and distorted head, about one-quarter 

 nat. size. L. Lias; Lyme Regis. m, cleft of mouth; orb., orbit; 

 , cephalic spines fixed to triradiate bases which would be imbedded in the 

 skin. (British Museum, no. 39880.) 



